Question 1

The description shows the silver charger comes with qc2.0 adapter and the black charger comes with qc3.0 adapter. what's the difference?

Accepted Answer

Qualcomm boasts a fourfold increase in charging times over conventional chargers with Quick Charge 3.0, up from the 40 percent speed increase offered by its first generation technology. However, one of the interesting things to note is that Qualcomm isn’t touting massive increases in charging times over version 2.0, instead the company is focusing on improved efficiency this time around.

The major new feature with 3.0 is INOV (Intelligent Negotiation for Optimum Voltage), which allows for a fined tuned power output and a more optimized charging cycle. Firstly, different batteries require different charging voltages. Version 2.0 supported four modes at varying power levels, 5 volts/2amps, 9V/2A, 12V/1.67A, and a 20 volt option. Quick Charge 3.0’s INOV communicates with the device to request any voltage between 3.2V and 20V at 200mV increments, allowing for a wider selection of voltages. (  disclaimer: I don't own this material, used for education purposes only )

Question 2

What's the difference between this and the other Nanami fast charging stands that's a little cheaper?

Accepted Answer

First off  have same question and all the answers u received are INCORRECT - both "models" you speak of come 2 ways and in 2 different colors for each way. 
Black Model# ACM220B - 3 piece package (M220 stand, USB cable, QC3.0 FAST CHARGING ADAPTER) cost $25.99 - This one has an angular shaped stand - I believe it is an earlier model based on the detailed description.
Black Model#  ACA800 - 3 piece package (A800 stand, USB cable, QC3.0 FAST CHARGING ADAPTER) cost $24.99 . This model has a more rounded shaped stand, doesn't have the sharp angles of the other model that is exactly the same in every other way functionally also in the title they use the word "UPGRADED" for the A800 Stand if you buy just the stand w/o USB cable & Adapter.
Black - Fast Wireless Charging Stand M220 - with USB Cable only - $18.99
Black - Fast Wireless Charging Stand A800 - with USB Cable only - $16.99
Again, Both come with the stand - M220 - Angular, A800 smooth curved, USB cable & Instructions, no A/C adapter. And the details say that the AC800 is the new and improved version supporting some additional phone models listed - read it. IMO Buy the one u thing is better looking or if u have a specific model (not iPhone or Samsung some other brands mentioned) that new one may support that older one doesn't - remember that "new & old" in this industry could mean a difference of 6 months to a year. Both models come in 1 other color - The M220 also comes in Elegant Silver for $2.00 more in the stand & cable package and only $1.00 more in the 3 piece package with the QC 3.0 adapter - (look at the picture - the description for the Silver Adapter says 5V/2.0A which may be the spec for 3.0 adapter but picture clearly shows same adapter as the black model with QC 3.0 stamped on it). The A800 comes in White for $3.00 more for just stand & cord package only $1.00 more for 3 piece package including the QC 3.0.

Note: As of 12/14/21 - both Editions have coupons- between 5% & 6% depending on 2 or 3 piece package and/or color- Black, White or Silver.

Question 3

Does this fast charge a Samsung galaxy s7 smartphone?  Thank you for your time.

Accepted Answer

I don't have a Samsung Galaxy s7, but for s6 edge work just fine .

Question 4

Foldable adapter?

Accepted Answer

not foldable.

it charges fast though..

ASIN	B07DC2MJR4
Amperage	2 A
Best Sellers Rank	#3,494 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #77 in Cell Phone Wireless Chargers
Brand	NANAMI
Built-In Media	User Manual; 20W USB-C charger adapter;Type C Cable;Wireless Charger Stand
Color	Classic Black
Compatible Cellular Phone Models	Apple iPhone 16, Samsung Galaxy S25
Compatible Devices	iPhone 18 Pro/iPhone 18 Pro Max/iPhone 17/17 Air/17 Pro/17 Pro Max/iPhone 16/16 Plus/16 Pro/16 Pro Max/iPhone 15/15 Pro Max/iPhone 14/14 Pro Max/iPhone 13/13 Mini/13 Pro Max/iPhone 12/12 Mini/12 Pro Max/IPhone X/ iPhone XS/ iPhone XS Max /iPhone XR /iPhone 8 Plus/ iPhone 8/Samsung Galaxy S26/S26+/S26 Ultra/S25/S25+/S25 Ultra/S24/S24+/S24 Ultra/S23/S23+/S23 Ultra/S22/S22+/S22 Ultra/S21/S21+/S21 Ult…
Compatible Phone Models	iPhone 18 Pro/iPhone 18 Pro Max/iPhone 17/17 air/17 Pro/17 Pro Max/iPhone 16/16 Plus/16 Pro/16 Pro Max/iPhone 15/15 Pro/15 Pro Max/iPhone 14/14 Pro/14 Pro Max/iPhone 13/13 Mini/13 Pro/13 Pro Max/iPhone 12/12 Mini/12 Pro Max/iPhone 11/iPhone 11 Pro/iPhone 11 Pro Max/iPhone X/ iPhone XS/ iPhone XS Max /iPhone XR /iPhone 8 Plus/ iPhone 8/Samsung Galaxy S26/S26+/S26 Ultra/S25/S25+/S25 Ultra/S24/S24+/S…
Connectivity Technology	Usb,Wireless
Connector Type	USB Type C
Current Rating	2 A
Customer Reviews	4.4 4.4 out of 5 stars (10,858)
Enclosure Material	Plastic
Input Voltage	5 volts
Main Power Connector Type	2 Pin
Manufacturer	NANAMI
Mfr Part Number	ACM220B
Model Number	PG-20PD-U
Mounting Type	Wall Mount
Number of Items	1
Number of Power Levels	1
Output Current	2 A
Output Voltage	5
Power Source	Corded Electric
Special Features	Fast Charging, Wireless Charging, charger stand
Specification Met	ETL
Total Usb Ports	1
Unit Count	1 Count
Warranty Description	12 Months
Wattage	7.5 watts
Wireless Charging Standard	Qi

NANAMI Fast Wireless Charger Charging Stand with 20W PD Adapter

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